Question

A colourblind man marries a woman with normal sight who has no history of colour blindless what is probability of grandson being colour blind

Answer 1

i think it is 25% b'coz if the male is colour blind and the female is normal so in their offsprings all female will b carrier and all boys are normal.and if the boys marries their sons will be normal and if the female marries their 1 son will be colour blind and 1 will be normal..so total no of grandsons is 4 and 1 is colour blind so the % is 25